public void handle(final Callback[] callbacks) throws IOException, UnsupportedCallbackException {
final SecurityContext context = doPrivileged(securityContext());
for (final Callback current : callbacks) {
if (current instanceof NameCallback) {
final NameCallback ncb = (NameCallback) current;
if (context != null) {
final Set<Identity> identities = context.getSubjectInfo().getIdentities();
if (identities.isEmpty()) {
ncb.setName(DOLLAR_LOCAL);
} else {
final Identity identity = identities.iterator().next();
ncb.setName(identity.getName());
}
} else {
ncb.setName(DOLLAR_LOCAL);
}
} else if (current instanceof PasswordCallback) {
if (context != null) {
final PasswordCallback pcb = (PasswordCallback) current;
final Set<Identity> identities = context.getSubjectInfo().getIdentities();